Ordering wheels, last questions/help

[Nick.V70]

Right now I am running on my 70' Chevelle the following-

Front Suspension - Hotchkis 1" coils & 2" spindles
Rear Suspension - 3" coils

Front 20"x8.5" & 255/35r20
Rear 20"x10" & 275/40r20

Here is how the car sits:




I put a floor jack under it to lift the rear 1" to say it's 2" drop so I can have some "Rack" look to it. I like it better this way over the 20"s.





BIG Questions I need help with-

1. Is there a rubber isolator that sits on top of the rear coils and then sitting in the chassis pocket? (my car seems to sit lower in the rear than others I see)

2. What size tire are most running up front with a 20"? Mine are VERY tight, I haven't had a alignment and that will help but still thinking my front tire size if off/ to large?

3. Should I drop to a 19" front wheel so I can drop tire size for better clearance? I really like the 20"s front and back .


I am ordering my new wheels and tires so I want to make sure I am going the right direction. If anyone can help that would be great